Controlling apparatus for motors.



C. N. MOISAN & W. A. SMITH. CONTROLHNG APPARATUS FOR MOTORS. APPUCATION FILED JAN. 4, 1911.

1 ,2'78, 1 9 l Patented Sept 10, 1918;

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UNITED STATES PATENT OFFICE.

CALIXA N. MOISAN AND WILLIAM A. SMITH, OF MONTREAL, QUEBEC, CANADA.

CONTROLLING APPARATUS FOR MOTORS.

Specification of Letters Patent.

Patented Sept. 10, 1918.

Application filed January 4, 1917. Serial No. 140,623.

To all whom it may concern-.-

Be it known that we, CALIXA N. MOISAN and WILLIAM A. SMITH, both subjects of the King of Great Britain, and residents of the city of Montreal, in the Province of Quebec and Dominion of Canada, have invented certain new and useful Improvements in Controlling Apparatus for Motors, of which the following is a full, clear, and exact description.

This invention relates to improvements in controlling apparatus for motors, and the object of the invention is to provide a simple and efficient means for stopping a motor at the end of a predetermined number of revo lutions.

The device consists essentially of a pair of terminals ofopen ring form and a rotary circuit makeroperated by the motor, together with an electro-mechanical device for releasing the circuit maker and for stopping the same at the opening in the terminals. The terminals may be either stationary or movable. In the former case, the circuit is closed 'by permitting the circuit maker initial movement independent of the motor, and in the-latter case, by moving the terminals. The device may be operated to allow the motor either less or more than a complete revolution by moving the terminals in one direction or the other during the travel of the circuit maker.

In the drawings which illustrate the invention:-

Figure 1 is a perspective diagram of the apparatus.

Fig. 2 is a partial sectional view of one form of circuit maker.

Fig. 3 is a diametric sectional view of the terminals.

Fig. 4 is a side elevation showing the terminals movable for opening and closing the circuit.

Fig. 5 is a side elevation illustrating an apparatus for premittlng the motor less or more than one revolution.

Referring more particularly to the drawings, 11 designates a motor dlrect connected to some apparatus 12, which it is desired to operate intermittently. The motor 15 provided with a shaft 13, which passes centrally through a pair of ring terminals 14, each having an opening 15 therein. These terminals are electrically separate, and form a break in the circuit 16 of the motor, closure of which will permit current to flow through the motor 0011s. As shown in Fig. 3, the" rin 14 are mounted side by side in an insulating holder 17, which may in turn be mounted in a suitable casing 18 having feet 19 for securing it to a. base.

The terminals may be mounted in various ways, such as the stationary mounting shown in Fig. 3 or the movable mounting shown in Figs. 4 and 5. In Fig. 4, the casing 18 is revolubly mounted in a shell 20 havin supporting feet 19. The casing is provided with an arm 21 having any suitable operating connection, as indlcated at 22. The elements 31 and 32 will perform the same function in this construction as in the construction shown in Fig. 1, namely, to release the arm 24 and to provide a stop, preventing it from running past the gap in the terminals by its own momentum and thus connecting the terminals. They may obviously be operated in the same manner as shown in Fig. 1. In Fig. 5, the casing 18 is shown externally toothed for engagement with a worm wheel or other gear 23, by means of which the casing may be revolved. The casing will of course be mounted in a suitable shell, such as that shown in Fig. 4.

A circuit maker 24 is rigidly connected to the motor shaft so as to revolve therewith and travel on the terminals 14, electrically connecting the same except when the circuit maker is in the break 15. The circuit maker is provided with either rollers 25 or shoes 26 (see Fig. 4) mounted on independent spring pressed plungers 27, so as to insure perfect contact with the terminals. These plungers have a flexible electric connection 28 between them and are suitably insulated from the body of the circuit maker, as at 29. The circuit maker may be' of the jointed or rigid type. The jointed type is shown in Figs. 1 and 2, and consists merely of a hinge 30 formed intermediate the ends of the circuit maker, and having a limited movement, so that the outer or hin eably connected part of the circuit maker Wlll not move through more than a small angle. The rigid form of circuit maker is shown in F 1g. 4 and requires no description.

For releasing the circuit maker to start the and link 36 with the lever 33. An electro-' magnet 37 is provided having an armature 38 attached to the lever 33. A circuit closing device 39 is provided for the magnet:

The operation of the device is extremely simple. When it is desired to start the motor, the circuit of the magnet 37 is closed and the magnet draws up its armature, thus moving the lever 33 and retracting the stop 31, so that the circuit maker 24 is liberated. \Vith the hinge type of circuit maker, the outer part drops, so that the elements 25 engage the terminals 14 and close the motor circuit. The motor immediately starts, and as the circuit maker is rigidly connected for movementwith the motor, it travels around on the terminals until it comes to the break 15, whereupon the motor circuit is opened and the. motor is stopped, both by lack of driving power and by the presence of'either the stop 31 or the stop 32- in the path of the circuit maker. Normally, as soon as the motor has started, the magnet 37 will be disenergized and the spring 34: will return the stops to the position shown in Fig. 1. If, however, for any reason, the magnet circuit should remain closed, the stop 31 will be fully retracted, but the stop 32 will be projected into the path of the circuit maker, so that the motor will be stopped in exactly the same manner. If the rollers 25 do not obtain sufiicient gri on the terminals to keepthe circuit ma erstraight once the motor starts, shoes, as shown in Fig. 4, may be used, and the increased friction or drag of the shoes will secure the desired result. It is intended, however, that the presser springs of the wheels will make up for any drop or bending of the circuit maker.

In Fig. 5, the terminal driving gear 23 may be connected in any suitable manner to the motor, as for instance, by a disk 10 and sliding roller clutch 41, so that the gear 23 may be operated at various speeds in either direction by the motor. if the terminals travel in the same direction as the circuit maker, more than one revolution of the motor will be permitted, while if they travel in the opposite direction, less than one revolution will be permitted. Fractional revolutions may obviously be obtained with an arrangement such as in Fig. l by increasing the num- Obviously,

ber of breaks in the terminals and correspondingly multiplying the number of stops.

From the foregoing descriptiomit will be readily seen that we have provided a simple and efficient means forstopping a motor at the end of a predetermined amount of-revolution. It will be understood that the embodiments of the invention have been described with only suflicjent particularity to enable a proper understanding of same, and that the invention is not limited to the forms shown, as in practice, a number of changes may be necessary to adapt the device to particular classes of work.

Having thus described our invention, what We claim is 1. The combination with a motor and motor circuit, of a device of the character described, comprising a pair of terminals of open ring form in the motor circuit, a motordriven circuit maker arranged to engage and disengage said terminals, and means for releasing the circuit maker to engage the terminals and for reengagin said circuit maker to stop movement thereo and an auxiliary stop engageable with the circuit maker if the first named stop fails to engage same. 2. The combination with a motor and motor circuit, of a device of the character described, a pair of terminals of open ring form inserted in the motor circuit, a motor driven circuit maker engageable with and disengageable from said terminals, and a circuit maker releasing and holding device including an escapement mechanism, including a pair of stops projected alternately thereby into the path of the circuit maker, an electro-magnet arranged to operate said escapement device in one direction, and a spring arranged to operate same in the opposite direction.

3. The combination with a motor and motor circuit, of a device of the character described, comprising a pair of terminals of open ring form in the motor circuit, a motor driven circuit maker arranged to engage and disengage said terminals, and means for releasing the circuit maker to engage the terminals comprising two stops, coacting levers secured to the stops and electro-magnetic means for operating the coactin levers.

4. n combination with a motor and a motor supply circuit therefor, a pair of terminals of open ring form inserted in said circuit, a circuitmaker controlling said circuitdriven by the motor, and means for causin said maker to break the circuit to sto t e motor comprising a hinge, the Era er being in parts connected by said lnge.

5. In combination with a motor and a.

motor supply circuit therefor, 21 1pair of terminals of open ring form inse1'te( in said circuit. a circuit maker controlling said circuit driven by the motor, and means for releasing said circuit maker to close said motor circuit comprising pins in the path of the circuit maker and compound levers for workmg the pins in alternate directions.

In Witness whereof, We have hereunto set our hands;

CALIXA N. MOESAN. WILLIAM A. SMITH. 

